Eight tips commonly used in PHP website development

This article mainly introduces eight tips commonly used in PHP website development, this article describes naming, usage, PHP determining whether to submit a Form, PHP obtaining the string length, PHP Super global object, and so on, you can refer to PHP as a server scripting language for creating dynamic web pages. Like ASP and ColdFusion, users can use PHP and HTML to write WEB pages. when the visitor browses the page, the server first processes the PHP commands on the page, then, the processed results and HTML content are sent to the browser at the access end. However, unlike ASP or ColdFusion, PHP is an open source code program with good cross-platform compatibility. You can run PHP on Windows NT and many versions of Unix systems, and run PHP as a built-in module of the Apache server or CGI program. This article summarizes eight tips commonly used in daily PHP development.

PHP batch obtains the maximum checkbox value

1. name

The code is as follows:

$ Expr = join (",", $ _ POST ['checkbox']);
$ SQL = "select * from tbl_name where field in ($ expr )";
}

If the field involved in the control is numeric

The code is as follows:

If (! Empty ($ _ POST ['checkbox']) {
$ Expr = "'". join ("', '", $ _ POST ['checkbox']). ".";
$ SQL = "select * from tbl_name where field in ($ expr )";
}

3. PHP checks whether the Form is submitted.

The code is as follows:

$ Action = $ HTTP_POST_VARS ["Button1"];

If ($ action = "submit ")
{
// Execute the form operation
}
Else
{
// Read the default value
}

4. PHP obtains the string length.

The code is as follows:

Strlen ($ myrow [1])

PHP Url redirection

The code is as follows:

Header ("Location:". $ _ SERVER ["HTTP_REFERER"]);

5. PHP Super global object

The code is as follows:

<? Php
$ A = 1;
$ B = 2;
Function Sum ()
{
$ GLOBALS ["B"] = $ GLOBALS ["a"] + $ GLOBALS ["B"];
}
Sum ();
Echo $ B;
?>

6. PHP form values

If mothod = "get", replace $ _ GET ["test"] with $ test.

If mothod = "post", replace $ _ POST ["test"] with $ test.

7. PHP obtains the current IP address

The code is as follows:

<? = $ HTTP_SERVER_VARS ["REMOTE_ADDR"]?>

8. PHP obtains the current time

The code is as follows:

<? Php
Echo date ("Y-m-d G: I: s ");
?>
Date ("Y-m-D ")
Date ("Y-n-j ")